Mauna Loa, an active volcano on Hawaii's Big Island, is widely considered the largest land volcano on Earth. It has a volume of 18,000 cubic miles! Because of its shape, Mauna Loa is known as a shield volcano. The last time it erupted was 1984, when lava poured out of vents on its northeast rift zone on Pu‘u‘ula‘ula (Red Hill), shown below. No recent eruptions have killed anyone, but they have destroyed villages.

Taal Volcano, located on the island of Luzon, is the second most active volcano in the Philippines. It has erupted violently several times in the past, including a 1911 eruption that killed more than 1,300 people and destroyed homes and livestock. It last erupted in 1977.

Tenerife is the largest island in the Canary Island archipelago, crowned by Pico de Teide volcano. At 12,198 feet above sea level, the peak, shown in this satellite image taken in August 1991, represents the highest elevation in the Atlantic Ocean. Teide has erupted several times since the island was settled in 1402, most recently in 1909.

Colima volcano, shown in this image captured by one of NASA's Earth Observing satellites in January of 2010, is part of a complex of volcanoes that includes Volcán de Colima, Nevado de Colima and El Cantaro (spanish for "the pitcher.") Colima is Mexico's most active volcano and has been erupting since 1998. It's still venting lava today.

Avachinsky Volcano — pictured here in a shot captured by a crew member of the International Space Station — is an active stratovolcano, meaning it's made of alternating layers of lava and ash. It's located on the Kamchatka Peninsula in eastern Russia and last erupted in 2008. An entire city, Petropavlovsk, is built atop Avanchinsky's scattered debris — avalanche deposits that are between 30,000 and 40,000 years old. Scientists think it could be at risk from a similar eruption in the future.

Galeras Volcano, seen here from space, is also a stratovolcano. This one is located near the Colombian city of Pasto. Galeras last erupted between 2012 and 2013. An eruption in 1993 killed 9 people, including 6 scientists who were sampling gases in its crater at the time.

Mount Vesuvius, an active stratovolcano in the Gulf of Naples, Italy, is most famous for the A.D. 79 eruption that buried Pompeii and several nearby cities in a layer of hot ash. The volcano, seen in this image taken August 8, 2011, has erupted about three dozen times since then. It last erupted in 1944, and will undoubtedly erupt again, scientists say.

Mount Etna is an active stratovolcano on the eastern coast of Sicily, Italy. It's 10,922 feet high, making it the tallest active volcano in continental Europe! You can see it erupting most recently in the image below, which shows telltale plumes of ash and gas. This photo was captured by NASA's Landsat 8 in November 2013. As of May 2015, Etna was still erupting.

Mount Merapi, whose name in Indonesian means "fire mountain," is an active volcano bordering Central Java and Yogyakarta, Indonesia. The volcano, shown in this aerial photo, has erupted regularly since 1548, and most recently blew its top in March-April 2014.

Mount Nyiragongo, shown in this satellite image taken in February, is an active stratovolcano in the Virunga Mountains in the Democratic Republic of Congo. Eruptions in 1977 and 2002 killed about 70 people and 147 people, respectively, in the nearby city of Goma.

Washington's Mount Rainier, seen in this image taken by an Expedition 15 crewmember on the International Space Station, is the highest mountain in the Cascade Range, with an elevation of 14,411 feet. It last erupted in 1894. When it erupts again, it could threaten people living in or visiting surrounding areas, including Rainier National Park, as well as people flying over it.

Mount Unzen, shown here with its neighbor, Mount Fugen-dake, is part of a an active group of stratovolcanoes near the city of Shimabara on the island of Kyushu. In 1792, one of its lava domes collapsed and produced a tsunami that killed about 15,000 people. It lay dormant for nearly 200 years, before erupting again from 1990-1995.

Sakurajima is an active volcano in Kyushu, Japan, which was formerly an island. In 1914, an eruption connected the island with the Osumi Peninsula. The volcano has been erupting almost continually since 1955. This satellite image taken on August 18, 2013 captured an eruption that spewed ash 20,000 feet above nearby Kagoshima Bay.

Santa Maria, shown in this satellite image taken in mid-January 2007, is a 12,375-foot-tall stratovolcano in Guatemala, composed of layers of hardened ash, lava and rock. When it erupted in 1902, it wreaked havoc on southwestern Guatemala. The volcano awakened again in 1922 and has been erupting ever since.

Santorini, seen in this photograph taken by an crewmember on the International Space Station, is a Greek island in the Aegean Sea formed by a volcanic caldera, the cauldron-like volcanic features formed when a volcanic eruption causes surrounding land to collapse. Once known as Thera, the island was created by layers of lava produced by overlapping shield volcanoes. Its 4th and most recent major eruption, in 1620 B.C., created the islands and bay visible today.

Ulawun Volcano, photographed here by an Expedition 34 crew member on the International Space Station, is one of the most active volcanoes on the island of New Britain, Papua New Guinea. It is also one of the highest, with an elevation of more than 7,600 feet. It last erupted in 2013.